When they escape from the building in the first dream, the right-hand mirror of the van is broken by the narrow gate. In the following shot when they are driving, the other mirror is broken and the right mirror is suddenly undamaged. (Not due to flipped shot, note license plate.)
The song that is played to wake everyone up is Edith Piaf's "Non, je ne regrette rien". Marion Cottillard (Mal) played Piaf in the biopic La Vie En Rose and won an Oscar for it.